This circuit intermittently activates a relay. It was obtained in a 1980 publication. In fact, we recommend a 6 or 12 V supply depending on the relay used. The transistor can be the BC548. The frequency adjustment is done in R1 and the integrated circuit can be 4001 or 4011 CMOS. The diode can also be 1N4002 or 1N4004.
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